Rules to Calculate the Projected Final Amount (HA)
You can update either the ETCA (estimate-to-complete amount) or the EACA (estimate-at-completion amounts) field:
Note: Regardless of which field you
                update, the system updates the new projected final values into the BORG field of the
                HA ledger, and the balance/adjustment is made through the net posting field.
            
        - If you enter the estimate-to-complete amount, the system calculates HA using the formula ETCA + AA. 
- If you enter the EACA value, the system calculates difference between EACA and AA and displays ETCA. 
- If EACA is zero, the system calculates HA using one of the two formulas AA + PA or RBLA, whichever is greater.